<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
  </head>
  <body>
    <button id="btn">按钮</button>
    <div id="app"></div>
    <script type="text/babel">
      let arr = [1, 2, 3, 4, 5, 6];
      const oBtn = document.getElementById("btn");
      const vDom = (
        <ul>
          {arr.map((item) => 
            <li key={item}>{item}</li>
          )}
        </ul>
      );
      const root = ReactDOM.createRoot(document.getElementById("app"));
      root.render(vDom);
      oBtn.onclick = function () {
        arr.splice(1,0,"sdf");
        const vDom = (
          <ul>
            {arr.map((item) => 
              <li key={item}>{item}</li>
            )}
          </ul>
        );
        root.render(vDom);
      };
      /* 
diff算法比较策略（tree ）
*/
    </script>
  </body>
</html>
